Telephone receiver



Sept. 8, 1925.

H. "31AM.

TELEPHONE RECEIVER Filed Mamh 20, 1.925

thercor Tl Patented Sept. 8, i925.

uurrso sm'rss PATENT OFFICE.

TELEPHONE RECEIVER.

Application filed March 20, 192 5.;-.Se ria1 No. 17,081.

To all whom it may concern:

.Be it known that I, HENRY l. SAAL, a citizen of the United States. residing at Chicago, in the county of Cook and the State of Illinois, have invented a certain new and useful Improvement in Telephone Receivers, of which the following is a full, clear, concise and exact description.

My invention relates to telephone r 1o ceivers employing polarized clcctromagncts whose armatures are connected with the re ceiver diaphragms by means of links which serve to transmit vibrations to the diaphragins instead of the diaphragnis being 15. directly subject to the action of the receiver magnets.

In. carrying out my invention, the (haphragin of such a receiver is made of any suitable resilient sheet material, such as M) mica, bakelite or a suitable metal, and this diaphragm is tensioned to resist deflection from its normal plane in either direction. A link connects the diaphragm with the receiver armature in a manner to maintain a lined distance between the portions of the armature and diaphragm connected thereby, whereby the diaphragm may position the armature centre ly between the magnet polesand resist the movement of the armature 39 from and restore the armature to its central position. H 4 1 I employ a resilient coupling between the link and diaphragm wlnch prevents grab ing noise and preserves, unimpaired, the

in mechanical union between these parts.

The invention will be more fully explained in connection with the accompanying drawing in which Fig. l is a sectional view ola watch case receiver made in accordamc with MP the preferred embodiment of the invention,

a portion of the bodyof the receiver casing be ng broken away; Fig.2 is a View of the receiver on line 2--?. of Fig. l, with parts removed and broken away: Fig. 3 is a view of the receiver on line 33 of Fig. l, with parts broken away; and Fig. 4 is a View in elevation, of the receiver nnnus the casing and diaphragm.

Like parts are indicated by similar charac tors of reference throughout the different figures. r

The cup or body portion l of the watch case receiver casing: is exterirly tl tried at its rim receive theorising cap screwed. having a central sound convey ing pzissage 3, here shown as being intcriorly threaded for connection with a sound amplifying horn, A. rigid cup 4 has its circular outsetting rim 5 clamped between the threaded end of the casing body and an annular ridge 6 formed upon the interior of the cap 2. The c iaphragm 7, composed of mica, bakclitc. or other suitable resilient sheet material, is interposed and clamped between the ridge andithc annular rim of the cup, this rim constituting a seat for the diaphragm. The diaphragm is tcusioncd to resist deflection from its normal plane in either direction. A rivet h passes through a central portion oi the diaphragm and has flanges 9 and 10. one upon each side of the diaphragm. The flange 9 is integrally formed with the body of the rivet and the flange .10 is secured in place by staking the rivet body as indicated at 11. washers 12 and 13 are cmph yed, one being clamped between each rivet flange and the adjacent face of the diaphragm. A link 14: is screwed, at one end. into saidrivet and is further secured thereto ay' il/(ll'OP of solder 15 upon the outer culls: of the link and rivet. This link is connected in it's other end to -onc end of the armature llinwhich is centrz'illypivoted upon the .ti 'fi'lll) 17a between the U shaped polar cxteusibnsili iirovided upon. the permanent magi i-o 153 and stir rounded hy thc receiver winding 20. The connection of the link uhd" armature is desirahly effected by means of the hdok 14' upon the link passing through the angular end 16' ol the armhturc. drop of solder Ll" further holding the armature and link together. The link serves to maintain'la. lixcd distance between the parts of the armature and diaphragm connected thereby, whereby the diaphragm will resist the mm'cnient of the armature from its middle position and will restore it thereto. The cushions or flexible coupling 9, 1o prevent grating noise between the link and dilaphragines well as prevent inipairn'urnt of theincchanical uuionbctwcen theseparts. it is obvious that changes may be made without departing from the spirit of my invention.

Having: thus described my invention I claim as new and desire to secure by Letiil'z; Patent the following-- 1. A telephone receiver including? a polarized clcctroiuagnot having an :Hlnuiurc; an

annular diaphragm seat; a diaphragm of resilient sheet material secured at its periphery upon said sent and tensioned to resist deflection from its normal plane in either direction; a rivet passing through an censral portion of the diaphragm and new ing a flange upon each side of the diaphragm; a cushion Washer clamped between,

ized eleetromagnet having an iii-mature; an annular diaphragm seat; a diaphragm of resilient sheet material secured at its periphery upon said seat and tensioned to re- SlSiZ CiEfiGClZIOD from lllS normal gilane 1n either direction; a iivet passing throuqh a central portion of the diaphragm and neving a flange upon each side of the die-- the parts of the armature and diaphragm connected thereby.

3. A telephone receiver including a polar ized electromagnet having an armature; an annular diaphragm seat; a, diaphragm of resilient sheet material secured at its periphery upon said seat and tensioned to re gist deflection from its nori'nel plane in either direction; a link connected at one end with said armature; and u resilient coupling between the other end of the link: and scenillzll poreion of the dieplu egm, the link and coupling serving ho maintain e fixed distance between the parts of the armature my name. A

HENRI o. SAAL. 

